java.lang.NullPointerException

Attempt to get length of null array

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Stack trace

  • java.lang.NullPointerException: Attempt to get length of null array at com.example.letwixtor.myapplication2.Main3Activity.ListDir(Main3Activity.java:117) at com.example.letwixtor.myapplication2.Main3Activity.onPrepareDialog(Main3Activity.java:99) at android.app.Activity.onPrepareDialog(Activity.java:3380) at android.app.Activity.showDialog(Activity.java:3444) at android.app.Activity.showDialog(Activity.java:3394) at com.example.letwixtor.myapplication2.Main3Activity$1.onClick(Main3Activity.java:43) at android.view.View.performClick(View.java:5198) at android.view.View$PerformClick.run(View.java:21147) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

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